Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation.
A146458
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =3a(11) =3a(12) =11a(13) =11a(14) =31a(15) =31a(16) =113a(17) =113a(18) =699a(19) =699a(20) =5221a(21) =5221a(22) =45431a(23) =45431a(24) =522967
External references
- oeis: A146458